Zetor PROXIMA GP Series Operator's Manual page 131

There are four positions of the lever (c) which controls quick couplers (5) and (6):
N - Neutral position. Quick coupler drives (5) and (6) are closed and oil in the hydraulic appliance connected
is blocked. Lever (c) is locked in this position.
5 - Pressure in quick coupler (5). Quick coupler (6) is connected with the drain. It is necessary to hold lever
(c) in this position, when released, lever (c) automatically returns to (N) position. In addition, quick
coupler (5) is equipped with a one-way valve - convenient for connecting a tool which requires higher
degree of impermeability - minimum lowering of the tool during transport.
6 - Pressure in quick coupler (6). Quick coupler (5) is connected with the drain. Lever (c) is locked in this
position.
P - Floating position. Both quick couplers (5) and (6) are connected with the drain and oil is free to flow in
both directions. Lever (c) is locked in this position.
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MECHANICAL HYDRAULICS
PGPPN051